Refereed versions of papers from a workshop held at DIMACS at Rutgers U. in April 1993, include essays and surveys on cluster analysis theory, methods and applications and related problems in psychology, computer vision, and target tracking. Among the topics are the median procedure for partitions; image segmentation based on optimal layering for precision tracking; mixture models for optical flow computation; and the visual perception of surfaces, their properties, and relationships. No index. Annotation copyright Book News, Inc. Portland, Or.